IUBio

Dolphin brain

Kalman Rubinson kr4 at is2.nyu.edu
Tue Jan 26 23:05:19 EST 1999


Sturla Molden (stumol at stud.ntnu.no) wrote:
> The mammal with the largest neocortex when the effect of
> body mass scaling is removed (that is, neocortical volume
> devided by bodymass^0.65) is the Echidna.

This is misleading.  A better index of cortical 'size' is the surface area
of the thin mantle of cortex.  Echidna cortex is lissencephalic (smooth
and not significantly formed into gyri and sulci) and, therefore, it is
unlikely that the echidna has high ratio of 'cortex' to body mass.

Kal



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